Home / 28,290.24-39,040.80-15,715.20

Finding the Fourth Proportional to 28,290.24, 39,040.80 and 15,715.20

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Solution

The fourth proportional to 28,290.24, 39,040.80 and 15,715.20 is: 21,687.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,290.24 : 39,040.80 = 15,715.20 : x
  2. Step 2: Convert to fraction form
    28,290.24/39,040.80 = 15,715.20/x
  3. Step 3: Cross multiply
    28,290.24x = 39,040.80 × 15,715.20
  4. Step 4: Simplify right side
    28,290.24x = 613,533,980.16
  5. Step 5: Solve for x
    x = 613,533,980.16/28,290.24
  6. Step 6: Final answer
    x = 21,687.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.